Compressors, Gas Turbines and Jet Engines
The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

Increase first at fast rate and then slow
Decrease continuously
Increase first at slow rate and then fast
First increase, reach maximum and then decrease

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Compressors, Gas Turbines and Jet Engines
Clearance volume in actual reciprocating compressors is essential

To accommodate Valves in the cylinder head
To attain high volumetric efficiency
To provide cushioning effect and also to avoid mechanical bang of piston with cylinder head
To provide cushioning effect

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